Malicious PDF — malware analysis report

Static analysis result for SHA-256 e48136bcca81508c…

MALICIOUS

PDF

79.3 KB Created: 2021-09-08 22:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0f3427c58c1c478f5bcaee2a8d603942 SHA-1: a759dfb7317db2d9561001f136ff94210cfcbbfc SHA-256: e48136bcca81508ce3e1da1032501cb6d82e5c4dfe38032e0c6257c15acff3fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, many of which are hosted on disposable domains or use common CMS upload vulnerabilities. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users into downloading further malware. No scripts were extracted, but the structure suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161338f478a7f5---polasirijumoli.pdf In PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/dedezosepon.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/texomixabakeraretivu.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346a53a9c90---lerilowogodikowubewepotuf.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/zafula.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16138a41312603---wivagosagakerotirileli.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/73267921348.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/47968174413.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/40024589852.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4888a9059---93509110523.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/ferinizovakonikokubaxo.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1630508545/files/gesafivimupokojunulobedul.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/14845069030.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/bixevifupureg.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/65380816096.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/70148360968.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d326816f7---85975286639.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/fujatakofujoxe.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4vsmtc6gsa9fjsobbi73ier863/27707709153.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/57114284250.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/10363804943.pdfIn PDF document text
    • http://airzo.net/userData/board/file/36895896101.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=download+great+gatsbyPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD101 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE918 10672 bytes
SHA-256: 376664d055a964887394c3de5488fd11a2fc4d681d3f92bb56ba6f990e1b6176
font_02_sfnt_off00010194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10194 17740 bytes
SHA-256: 4c5231777eb8f3ec8e5356b2266b5750150ba9ddbf6ed958423cd1357e12eaad

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